## Volume 9, Number 4, March 2019

#### A Survey on Enhanced RSA Algorithms

### Authors

Shaheen Saad Al-Kaabi and Samir Brahim Belhaouari, Hamad Bin Khalifa University (HBKU), Qatar

### Abstract

Cryptography is a field in computer science and mathematics that entails techniques of securing communication between two parties in the presence of a third party. This is achieved through the use of several methods, such as encryption, decryption, signing, generating of pseudorandom numbers, among many others. Cryptography uses a key, or some sort of a password to either encrypt or decrypt a message that needs to be kept secret. This is made possible using two classes of key-based encryption and decryption algorithms, namely symmetric and asymmetric algorithms. The best known and the most widely used public key system is RSA. This algorithm comprises of three phases, which are the key generation phase, encryption phase, and the decryption phase. Owing to the advancement in computing technology, RSA is prone to some security risks, which makes it less secure. The following paper preview different proposals on different methods used to enhance the RSA algorithm and increase its security. Some of these enhancements include combining the RSA algorithm with Diffie-Hellman or ElGamal algorithm, modification of RSA to include three or four prime numbers, offline storage of generated keys, a secured algorithm for RSA where the message can be encrypted using dual encryption keys, etc.

### Keywords

Cryptography, RSA Algorithm, Encryption, Decryption, Cryptosystem, Security, Public Key, Private Key.